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The Mian game:
First person shooter
Uses the new proprietary 3-D PAIN Engine
All weapons come in pairs, with a primary and secondary fire
Advanced AI coding will simulate group behaviours
For 1 or more players over LAN or Internet

The Expansion:
10 entirely new, diverse and bigger levels no texture ever reused, each level is entirely unique
4 new weapons, grouped in pairs, including a flamethrower/semi-machine gun
2 new multiplayer modes, including a hellish mutation of Capture the Flag
New multiplayer maps
Improved game engine: improved visual effects, updated network prediction code
Redesign entirely the single player campaign, or create new MP maps with the full set of editing/modding tools provided with the add-on